You would need to buy the acrylic powder, the liquid solvent, the brush, the oil they use on your cuticles, and you would need a drill system to shape it. If you are talking about gels, then you need a UV light source.
And you usually can't just paint over your nails, thats why they glue on a fake tip to start you off.
If you are talking about the 'gel' top coat they apply after your nails are done, this can be bought but again, you need a UV light to cure it.
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